Surprisingly, making your very own smoke grenade is pretty easy—and cheap. All you need is a saucepan or skillet, piezoelectric lighter, sugar and some potassium nitrate (easily available online and in most gardening stores).
Simply heat the ingredients over low heat until they're mixed together into a caramel-like gooey consistency. Wait for a dollop of the mixture to harden and you've got yourself a homemade smoke bomb ready to use for your next scientific experiment. It's also great for cheap movie effects or the sheer amusement of setting something on fire and watching it smoke like crazy.
Got other methods for creating a DIY smoke bomb? Share with us in the comments below!
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